feat(lexer): add type system keywords

Added four keywords for new type system:
- concept: Base type definition
- sub_concept: Enum/record sub-type definition
- concept_comparison: Compile-time enum mapping
- any: Universal type for dynamic contexts

Also added:
- CLAUDE.md with project instructions and commit guidelines
- Test coverage for new keywords
- Crate-level deny directives for unused variables and dead code

Fixed pre-existing clippy issues to pass pre-commit hooks.

src/bin/storybook-lsp.rs

@@ -21,8 +21,7 @@ async fn main() {
     let stdin = tokio::io::stdin();
     let stdout = tokio::io::stdout();
 
-    let (service, socket) =
-        LspService::new(storybook::lsp::StorybookLanguageServer::new);
+    let (service, socket) = LspService::new(storybook::lsp::StorybookLanguageServer::new);
 
     Server::new(stdin, stdout, socket).serve(service).await;
 }